Compatible with black iPhone but not white iPhone??

so i'm looking @ case here says it's compatible black iphone 4/4s not white, , looks same exact item says it's compatible iphones $2 more. wasn't aware white , black iphones looked different?

here are:
http://www.amazon.com/elago-version...jsx0/ref=sr_1_3?ie=utf8&qid=1326329217&sr=8-3
http://www.amazon.com/elago-sprint-...1ubq/ref=sr_1_4?ie=utf8&qid=1326329217&sr=8-4

what's difference here?

 

so upon doing google research, looks there rumors white iphone thicker black iphone, rumor. true?

 

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